查看Grove Dust Sensor的源代码
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Grove Dust Sensor
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== Overview == [[文件:PPD42NS.JPG | 600px]] * Detectable range of concentration 0~28,000 / 0 ~ 8000 pcs/liter / pcs/0.01cf * Detecting the particle diameter >1μm * Output: Negative Logic, Digital output, High: over 4.0V(Rev.2), Low: under 0.7V * Weight 28g * VCC 4.75~5.75V * Standby Current Supply 90mA * Dimensions 59(W) × 45(H) × 22(D) mm <br> == Example code == <source lang=cpp> /* Grove - Dust Sensor Demo v1.0 Interface to Shinyei Model PPD42NS Particle Sensor Program by Christopher Nafis Written April 2012 http://www.seeedstudio.com/depot/grove-dust-sensor-p-1050.html http://www.sca-shinyei.com/pdf/PPD42NS.pdf JST Pin 1 (Black Wire) => //Arduino GND JST Pin 3 (Red wire) => //Arduino 5VDC JST Pin 4 (Yellow wire) => //Arduino Digital Pin 8 */ int pin = 8; unsigned long duration; unsigned long starttime; unsigned long sampletime_ms = 30000; //sampe 30s unsigned long lowpulseoccupancy = 0; float ratio = 0; float concentration = 0; void setup() { Serial.begin(9600); pinMode(8,INPUT); starttime = millis(); //get the current time; } void loop() { duration = pulseIn(pin, LOW); // return us lowpulseoccupancy = lowpulseoccupancy + duration; if ((millis()-starttime) >= sampletime_ms) // if the sampel time = = 30s { // Integer percentage 0=>100 ratio = lowpulseoccupancy / (sampletime_ms * 10.0); // using spec sheet curve concentration = 1.1 * pow(ratio, 3) - 3.8 * pow(ratio, 2) + 520 * ratio + 0.62; Serial.print("concentration = "); Serial.print(concentration); Serial.println(" pcs/0.01cf, LowPulsOccu = "); Serial.print(lowpulseoccupancy); Serial.print(", Ratio = "); Serial.println(ratio); lowpulseoccupancy = 0; starttime = millis(); } } </source> <br><br> == Output == [[文件:PPD42NS-Characteristics.jpg]] <br> == Reference == * http://wiki.seeedstudio.com/Grove-Dust_Sensor/ * https://seeeddoc.github.io/Grove-Dust_Sensor/ * [https://publiclab.org/system/images/photos/000/010/161/original/Spec_PPD42NJ_Eng_SPP13001V00_20130319.pdf PPD42NS Datasheet] <br><br> <br><br> <br><br> <br><br> <br><br> <br><br>
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